is the wiring for these seperate or is it in the loom already? and how accurate are they would like one

 

Dont know about the wiring but they are very accurate.
They calculate your MPG and mileage by measuring your speed and fuel flow, so fuel used/miles travelled=MPG and then the amount of fuel in your tank/MPG=Mileage left before empty.

Annoyingly since converting to EFI I cannot use mine as the fuel flow sensor went inline with one of the MFI injectors and as they all now run from a fuel rail I cannot plumb it in anywhere

 

oh well im efi but thoght the xr3i efi came with them could you not use that ?

 

If your running Ford management then yes as I believe it takes the signal from the ECU, this of course does not help me though! lol

 

was gonna say my 3i efi had one lol

 

I always thought they were about as accurate as me sat in the passenger seat shouting numbers at the driver? If they are accurate would be a good feature to try and get working with an EFI conversion.

 

Yeah it's a basic formula so cant really be wrong lol
Just the same as you filling up your tank with say 47L of fuel then driving 200 miles and running out, pulling out your calculator to see that you've averaged 19.1 mpg.
The computer of course does this live constantly monitoring your fuel flow and speed so can give you an instant figure as well as an average and predicted mileage left.

Would love to get mine working again!
Need a little convertor to convert injector PW to the correct signal the computer wants to see and of course be calibrated to match.

 

tbh the one on my cab is doing exactly the same as the one on my old rst an reading 99mpg all the time your moving lol

 

Fuel flow sensor is dead or unpluged or the computer is faulty, it thinks your doing what ever speed and using no fuel hence the 99mpg reading..... if only it were true! lol

 

Karlos, you can use the fuel computer on the EFI version, you just do not connect one of the earths and wire strraight to the ECU outputs.

Pins:
1 = red = Perm +12V
2 = grey/green = Lights +12V
3 = brown/red = Fuel remaining on sender
4 = not used
5 = brown = Earth
6 = brown/white = Speed sensor
7 = brown/green = Fuel flow (pin 17 on ecu)
8 = not used
9 = black/yellow = Ign +12V

If you leave the other earth connected, you will not get over 11mpg max as the calculations will be incorrect.

 

Martin, I have a spare one sitting @ the top of my stairs if you want one?

IF I can find a plug for it (same as Sierra and early MK3 Granada models) then I'd be happy to wire it in for you.

 

I'm on standalone management but thanks!
Do you know what type of output pin 17 sends (or MFI flow sensor), I'm guessing it's variable resistance or pulses like the speed sender?

Would be good to try and build a convertor!

 

Off the top of my head, I suspect it would be pulsed.

You would need to either measure it or speak to someone like Stu or someone who can programme EEC-IV

 

Yeah thats what I was thinking.
Cheers!

 

Might pin 17 be an injector output? in which case you could probably use it?

EDIT, the fuel computer would probably be making assumptions about flow at stock fuel rail pressure with stock injector size.... so would be wrong.

Still possible, though. If the original mfi unit was in line with an injector it must be looking at 1/4 fuel used and multiply the out put? Assuming its voltage rises with fuel speed (think they have a little impeller type jobby in there) you could possibly put the sender inline with your fuel rail (etc) and use a variable resistor set up to calibrate its out put.

Assuming thats how they work.

Rob,

 

Think you could be right about it being a pulsed out put from the flow sender,

http://www.race-technology.com/conte...pcat=2&cat=728

I guess most senders will work using the same theory. Still not an impossible thing to do though mate. Ie, using a simple calibration circuit to alter the output of a sender so your fuel computer can make sense of it.

Assuming, the mfi sender is looking at 1/4 fuel used, (one injector), placing the sender on the fuel rail input would mean it was looking at 100% fuel used. So a simple circuit would divide the pulse out put by 4. Not sure how clean the out put from one of these is but if your fuel computer can interpret the results it can't be too bad. I think the pulse width will stay the same.....

 

I agree Rob, for it to work using an injector PW the converter would have to be programmable with injector size, fuel pressure and be calibrated to output the correct signal so thats getting a bit complex.
If it can go inline with the fuel feed to the rail and be divided by four then that is far simpler.
Assuming the flow sensor can flow enough to not be a restriction at high load (same or bigger diameter as the fuel line) another problem is that on MFI it measures flow reaching one injector where as if we put it inline with the fuel rail feed it will measure total flow including whats being returned to the tank so will be over reading.

 

Well my EFi Orion had one as standard in it and when i recently changed to OFAC Turbo ECU the computer reads but not accurately, ive worked it out to be 1/2 reading. So it thinks im doing 17mpg when in fact ive got nearer to 34mpg... Could this be a difference in the wiring as Fiesta RSTs did not have a fuel comp..?

 

you sure you just not doing 17mpg its an rs after all

 

ahhh, true, i forgot about the fuel return!

 

i had them in 2 orions i had..1 efi and the other mfi..neiter of them were acurate..i once ran out of petrol with over 100 mile range left yet sometimes it would read 1 mile left after filling up..just fixed my tank sender and ignored the computer after i conked out ha..

 

Yeah mine use to read 99 mpg too in my old Erst,was never very accurate either

 

the sender fixable then as my orion runs out about 1/4 of a tank and trip computer its not very accurate?

 

i just fitted a new sender..thing is if you fix the faults causing the computer to read wrong how long does it last before it needs redoing..i had the car when it was 11 year old and my uncle before that had it from 3 yo, and he said it never worked properly in all the time he had it..so im thinking using brand new parts ford only managed to make it last 3 year?? i know it could be a one off dodgy one though. the beeping is annoying aswell if it constantly reads low fuel

 

Well 21 years later mine still works perfectly, but any number of faults can cause it to be wrong of course.

 

i think i have more chance of finding a chocolate teapot rather than a fuel sender unit for my orion.anyone got one laying around for an mfi orion by any chance?

 

B19JUB, il have an ask about for you on the Orion Register m8, bound to be a spare fuel sensor on there... U mean flow sensor or in tank level sensor?

My fuel comp worked fine up until i put an OFAC ecu in the car...
Any1 know how to modify it to work with OFAC?

 

tank level sensor please mate.does my head in with gauge showing 1/4 and it running out of fuel

 

When mine used to do this it was the fuel gauge not the sender.

 

Yeh could be the gauge...

What earth should i try disconnecting to see if it makes the computer read more accurately with my OFAC setup?

 

any way of testing it?

 

I just tried another set of clocks.

 

Hi !
I'm a new man in Rs turbo club...
I have old European mk4 Cabby, now I'v got Cabby RS Turbo MFI..
can I put in Fuel comp ???
pleeese , can You tell me about it ... I try to find anything about it ..
best regards
Alex

 

hello my friend okay? I need a fuel flow sensor for my escort carbureted could help me find one? I'm from Brazil and I'm dying to get my computer to run fuel, thanks

 

got a full tank set up there,tank sender pump etc(of a mk4 mfi xr3i reckon it would be same )... fuel comp has its own loom well does on mfi...have a full fuel comp set up for mfi also...

 

hi all well? could contact me at my email powercrix@hotmail.com?
thank you very much

 

[CITAÇÃO = Karlos G; 5324852] Não sei sobre a fiação, mas eles são muito precisos.
Eles calculam seu MPG e quilometragem medindo sua velocidade e fluxo de combustível; portanto, combustível usado / milhas percorridas = MPG e, em seguida, a quantidade de combustível em seu tanque / MPG = Quilometragem deixada antes do vazio.

Irritantemente, desde a conversão para EFI, não posso usar o meu, pois o sensor de fluxo de combustível foi alinhado com um dos injetores da MFI e, como agora todos correm de um trilho de combustível, não consigo instalá-lo em nenhum lugar [/ CITAÇÕES]good afternoon everyone
a liquid crystal display on my companion's on-board computer has been damaged and I need another on-board computer.
it may even be burnt as long as the screen is fine.
why would anyone want to sell me?
thank you.

 

Anyone got a computer harness wiring diagram as not sure of where wires goto on the fuel sensor and speed sensors, or a picture of the plugs with sensors attached